Scrubbing machine



Feb. 28, 1939.

H.. J. POND SCRUBBING MACHINE Filed May 8,' 1957 III| gmc/wiwi, v Harold d. Pond gg, viding the brush with a body having a circular as both of these brush holders are identical in 20 Patented Feb. 28, 1939 I l UNITED STATES PATENT oFFioE SCRUBBING MACHINE Harold J. Pond, Minneapolis, Minn. Application May 8, 1937, Serial No. 141,524

8 Claims. (Cl. 15-49) My invention relates toy scrubbing machines tating such brush holders forming no feature of and has for an object to provide a machine utilizthe invention and being well known in the art ing a number of rotary brushes by means of has not been shown in detail in this application, which a swatch continuous throughout its lateral though it can readily be comprehended that any extent may be procured. suitable construction may be utilized for the pur- '5? Another object of the invention resides in pose. utilizing two revoluble brush holders and in at- In Fig. l I have shown a scrubbing machine taching to said brush holders, circular brushes which I have indicated in its entirety by the adapted to intermesh with one another. reference numeral I5. This scrubbing machine An object cf the invention resides in providing comprises a housing i6 having a forward portion 10' separate attaching means for each brush whereby il and a rearward portion i8. The rearward the brushes may be independently, easily and portion I8 houses an electric motor not shown quickly attached to or removed from the brush and is supported at the rearward end by means holders. of wheels I9. The portion il of the housing is A still further object of the invention resides houses a transmission mechanism not shown and 1'5- in 'mounting the attaching means on the brushes. rotatably supports two shafts 2i and 22 driven A feature of the invention resides in using a from the motor by the transmission. The shafts bolt for attaching the brush to the brush holder. 2i and 22 carry brush holders 23 and 24 which Another object of the invention resides in proare detachably secured to said shafts. Inasmuch or cylindrical surface or shoulder concentric with construction, only the brush holder 2d will be dethe axis of the bolt or fastening means and in scribed in detail. utilizing' a cam mounted on said brush holder The brush holder 24 consists of a plate 25 which for engagement with said surface to prevent unis in the shape of a clover leaf having three screwing of the bolt and unintentional disenblades or arms 26, 2l and 28 connected together gagement of the brush. and to a hub 29. Shaft 22 extends through the A still further object of the invention resides hub 29 and is provided with a shoulder and a in using as a cam a cylindrical head with an key, not shown, whereby the brush holder 24 is eccentric point. v driven. A compression spring 3i is seated against a0 A feature A of the invention resides in con the brush holder 24 and has an end 32 disposed 30 structing the body of the brush of wood in a slot 33. The spring 3i holds the brush and in roughening the surface of the cam to holder 24 universally mounted upon the end of cause the same to dig into the wood and cause the shaft 22. a binding between the cam head and brush body. Attached to the brush holders 23 and 2li are Other objects of the invention reside in the a number of brushes 34a, 34h, 34e, 34d, 34e and 35 novel combination and arrangement of parts and 34j which are identical in construction. For this in the details of construction hereinafter illus* reason the brushes 34d, 34e and 341 have been tlated and/ 01" described shown diagrammatically and only the brush 34a In the drawing: will be described in detail. The brush 34a is pro- Fig. l. is a side elevational view of a scrubbing vided with a cylindrical body 35 formed of ply 40 A() machine illustrating an embodiment 0f my'inwood which is drilled as shown in Fig. 3 at 36 vention. to receive the bristles 31 of the brush. The body Fig. 2 is an inverted plan view of a portion of 35 is cylindrical as shown and is provided at the the structure shown in Fig. 1. center of the same with a carriage bolt 38 shown 5; Fig. 3 is a detail sectional view taken on line in detail in Fig. 5 and which has a squared head 3 3 of Fig. 2 and drawn to a larger scale. 39 forced into the wood of the body. 4The bolt Fig. 4 is an inverted plan sectional View taken 38 is further constructed with threaded ends 4i on line @-4 of Fig. 3. projecting outwardly beyond the body of the Fig. 5 is a sectional detail view taken on line brush from the rearward surface thereof. The to' 5-5 of Fig. 2 and drawn to a larger scale. threaded end 4l of the bolt 38 is adapted to 5o My invention relates to scrubbing machines screw into a threaded boss i2 formed in the of the type in which two revoluble brush holders center of the blade of the brush holder 23. By carrying brushes are arranged to rotate in unison merely turning the brush bodily the same may to scrub the surface of a iioor on whichv the be applied to or removed from the brush holder 55 brushes rest. The particular mechanism for roon which the same is mounted. 55

To prevent loosening of the brushes the following construction is employed. For each brush a cam 40 is provided consisting of a cylindrical head 43, shown in detail in Figs. 3 and 4, which is knurled or otherwise roughened upon the exterior surface thereof as indicated at 44. This head has a shank or pin turned integral therewith which is eccentrically disposed with reference to the axis of said head. This pin extends through a boss 46 formed on the brush holders 24 and is rotatably mounted in bearings 41 in said boss. The end of the pin 45 is turned over as designated at 48 to prevent removal of said pin 45 from the bearing 41. In the outer face of the head 44 is provided a screw driver Jslot V49 by means of which the head may be rotated.

The bearings 41 are so situated that kthe knurled surface of the head 43 may in 4one lposition of the head engage the peripheral surface 5l of the body of the brush with which it associates when the head is in one position.V Due to the knurli-ng on theseheads the heads dig into the surface-s 5i of the brushes and prevent rotation of the brushes in a direction ytending to `unscrew the bolts 38. The heads 44 when turned jin the opposite direction clear the surfaces 5l of the bodies of the brushes and permit removal of or attachment of the brushes .-from or to .the brush holders. Arrangement lof the parts when the head is in such position is shown in Fig. 4 in dotted lines.

The method of using the yinvention is as .fol-

lows: Without the necessity of removing the brush holders .24 for y2?, brushes can be vapplied to .or -removed from the holders vby merely turning the heads =44 fof the various cams 48 to position the cams as shown in Fig. 4 in dot-ted lines. The brush may then be either attached to or removed from the holder `by mereiy rotating the brush to cause the bolt 38 :to screw into or out of the threaded boss 42. When the 'brush is rmly in position the heads 4'4 are .turned in the direc-tion indicated by the arrow in Fig. 4, through engagement of a screw driver wwith the slots 49. rThis causes vthe surface 44 of -the cam 4d to grip into the surface 5i of the brush and to hold the brush fromurther movement in la direction tending to disengage the brush.

My invention is highly advantageous in that an `extremely simple and practical construction is Aprovided by .means of which brushes may be attached to a. ybrush holder :and readily removed therefrom. The invention is extremely `positive and eiective and when the cams have been lplaced in operative position, positively prevent `disengagement .of the brushes from the brush holder. The cams can be easily .and vquickly-operated so that brushes may be Ireadily interchanged when desired.

Changes in .the .specic `form -o :my invention, as herein ydisclosed,'may be made within the scope of what .is claimed without departing from the spirit of my invention.

Having `described .my invention, what I claim as .new `and desire to protect by Letters Patent is.:

l. In a scrubbing machine, a revoluble brush holder, va brush including a disc-like body provid'- ing .a -cylindrical shoulder at the peripheral edge thereof, a bolt having its-axis at the center of said body and Shaving means securing .it tosaid body with its threaded end projecting therefrom, threads formed in said brush holder for engagement with the 'threaded vend of said bolt, whereby the brush may be attached to the brush .holder Aby rotation of said body, and cam means movably mounted with respect to said brush #holder Aand adapted to engage said shoulder of the body for holding the brush from rotation relative to said brush holder in a direction tending to unscrew the bolt from said threads.

2. In a scrubbing machine, a revoluble brush holder, a brush including a disc-like body pro.- viding a cylindrical shoulder at the peripheral edge thereof, said body and brush holder having juxtaposed parts situated in proximity to the center of said body, a bolt having its axis at the center of said body, said bolt extending through one of said parts and having means for holding it from rotation relative thereto and being adapted to screw into the other part to attach the brush to the brush holder, and cam means movably .mounted with respect to said brush holder and ing a cylindrical shoulder at the peripheral 'edge thereof, and constructed of wood, 'said body and brush holder having juxtaposed parts situated in proximity to the center -of said body, a `bolt having vits axis at the center of said body, 4said bolt extending th-rough one of said parts and having :means holding it from rotation relative thereto and `being adapted to screw into the other part -toattach the brush to the brush holder, and a-cam mounted von said brush holder for move* ment with respect thereto Aand having a roughened surface adapted to engage said shoulder and to kvdig into the surface thereof for holding lthe brush from rotation relative to said brush holder in one direction.

4. In -a scrubbing machine, a revoluble brush holder, a brush having a body .formed with a cylindrical shoulder, means Vheld from rotation relative to said body .and disposed at the center of said shoulder for attaching the brush to the holder, said :means requiring rotation .of the .brush to `effect detachment, la cylindrical member having a surface .adapted to engage said shoulder, said member and brush support having juxtaposed parts, a pin eccentrically situated with reference to the 'axis fof `'said cylindrical member, said pin being held from rotation relative to `one of said .parts vand being .revoluble relative to the other for guiding said member :for :movement ,toward :said shoulder to restrain rotation of said brush relative to said brush holder.

5. In :a scrubbing machine, a revoluble brush holder, fa brush having a body formed with a cylindrical shoulder, means held from rotation relative to said body and disposed at the center of said shoulder for attaching the brush to the holder, said means requiring rotation :of the brush to effect detachment, and larcam movably mounted with respect to `said brush holder and engaging said shoulder for locking the brush from rotation relative tothe brush holder.

6. In a scrubbing machine, a revoluble vbrush holder, a brush having a body .formed with a circular shoulder, fastening means held from rotation 'relative to .said `-body and disposed at the center of said shoulder and about the axis of which the ebrush may rotate said .fastening means including helical engaging `members 'adapted to become disengaged upon rotation of the brush, andan eccentric cam pivoted to said brush holder and adapted to be wedged against `said shoulder to restrain rotation `of said brush .relative to said brush holder.

7. In a scrubbing machine, a revoluble brush relative to said body and disposed at the center of said shoulder for attaching the brush to the holder, said means requiring rotation of the brush to effect detachment, a cylindrical member having a surface adapted to engage said shoulder, a pin integral with said member and eccentrically disposed With reference thereto, and a bearing in said brush holder for said pin, said bearing guiding said member for movement against the shoulder to restrain rotation of said brush relative to lo said brush holder.

HAROLD J. POND. 

